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Apparently there are several websites now days with easter eggs 'aka hidden things, because programmers were bored'. A famous code 'Up, Up, Down, Down, Left, Right, Left, Right, B, A, Start' is now appearing on several websites. Facebook and ESPN are a few of those websites. I didn't feel like searching through Facebook's 1mb+ of JavaScript to see how they did this, but I image it uses JavaScript key listener.